Design and Optical Properties of ZnS:Mn Thin-Film Electroluminescent Devices on 2D SiO2 Corrugated Photonic Crystal Substrates

• Published in: Journal of the Electrochemical Society 2006-01, Vol.153 (4), p.H71-H77
• Main Authors: Do, Young Rag, Ko, Ki-Young, Kim, Yoon-Chang, Cho, Sang-Hwan, Huh, Young-Duk, Yun, ` Sun Jin, Choi, Heayoung
• Format: Article
• Language: English
• ISSN: 0013-4651
• DOI: 10.1149/1.2170580

We studied the characteristics of ZnS:Mn thin-film electroluminescence (TFEL) display devices in which the glass substrate had been modified with a two-dimensional (2D) SiO2 corrugated photonic crystal (PC) pattern. The finite-difference time-domain (FDTD) method was used to predict the behavior of 2D corrugated PC ZnS:Mn TFEL devices with varying PC structural parameters. Based on the optimal parameters derived from the FDTD calculations, a 2D SiO2 corrugated PC layer was introduced onto the glass substrate of a typical ZnS:Mn TFEL structure by two-step irradiated hologram lithography and reactive ion etching. Experiments conducted under typical operating conditions showed that incorporation of the 2D corrugated structure improved the light extraction luminance at 40 V above the threshold voltage by over 3.1-fold compared to the conventional ZnS:Mn TFEL device, without noticeable degradation of the electrical characteristics. This improvement originates from the liberation of the photons trapped in the high-index guiding layers.